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U2FsdGVkX19JRvfQDGOYlExGqUAvsiQ8zjcNri/xny+hfvLEcXjH+WkDfVcuMlbR0SDMFVmeDs4YrbkxO2vQhc7GeT3YGIrLyQDhWcL3oy2N+p6DRBva7h0mPQVPN24MlDdKNoaSBF344iiFa6eJ0n3uyeweYDMQJqXHT+EMn6qVz64OF0qBzJxYhS+PCVyDV1CbP7oIlyJs0lNrcdb9x0YwJ+e1uwcBNL4P0EU87pzWDAh6mL8fBI1mqw2uYPIAuibWjEwSDEyDkUpCaYzZkX6/kf7F5yIfea9dSsLQwhQ+0gYR9CimjwkCLZpLpLOgtK/7CLNKFhYzNF5vxeatux/qAfIvdsMjQVFdOu7Oua61ZYD8IEAivm1PG63kgc1B9+baGBVMFHuR5xP2/vyPZqVoKeoeC+a304qlziG5OUzMUFb21+TjUxbUdRvivJ+ftjkFE2VyGplqg4/z3Eh1FGB8u3Y3khTEWtLuqOR4+vVgA/1lu3Iwu7DxY1jj8TzJ6RTmcW3FAt9VKNU42J04fvCGD7TiPWeiqgT2DPJ5uuyiZXIwxHEtsPOylIZwOELPm6F1Cix+QsUeXbsltLU+JjgJAyhkFHyf3KzkQjb6bF8DqtHvwDx2NpRuMuVOdcOWb3O/eYlqEyF+U68UGchx7SsBQuz8pSHjisItxN8A7/WCUmZ+G6eoSBWOTbYlaeOR7BFMvM1caeYzpm1ocsUB6CtGO0oKo9L8Mw+e5hKzzGKDRABxOwNZm459zVcxWCiYaOkmwjwepJUqCbPrZ4iOE9WJOimVc19PHqrzFUmFXGanXyyLKn6U32XnVQ8Du491RLPQN9IdtqMfn9/RBqExJZ7Et+XWGKzaxT+D7uI0gK5xieM4PLbXzadwF4YkfWrQ6wOIrXHnqtJ3DYj24vdbhLSiCXFTaALtrroMvtmlYMWm8j8HRjoX8a7racpStb7LJ3AF+pLl/hCbxgJ60pP HmkqdeHX liCrhCSAQejDzIQyrJ7+LDvKHvhTdJ0OOtyFTdoJxqjtNXuxlDi0ItyZG5C7G3j3PD+WG888y8/VvifejPBdGONHXuJbWVHWQTlt+4qF3625C/iPbgOj/z1/p7kqg07KK+AtNlggVEDksOMXoy3286q3y88tFM3ukaVhJFtI945lT3/ye1y4PIKWCgYhnBeRLVkEGoZDsDwcY69st5vhaFDd28+DquyOeY1jlL+sth1ndz9FLyIIWANmZRyHTmZ0QXl/K6NyjjCTRt0Wlo/8at4GvWvjZb/VloYAHx3Hqo/FyhGTzMtur09Rh0MUilSLP3+pT2Ye+tbBSbpPZ+jrGxJDDFJrtps+VRV58mNZDB5rDMlYopZCbqJ9LccWpE8jYQrFV X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 10/2/2025 6:54 AM, Zi Yan wrote: > On 2 Oct 2025, at 1:23, jane.chu@oracle.com wrote: > >> On 10/1/2025 7:04 PM, Zi Yan wrote: >>> On 1 Oct 2025, at 20:38, Zi Yan wrote: >>> >>>> On 1 Oct 2025, at 19:58, jane.chu@oracle.com wrote: >>>> >>>>> Hi, Zi Yan, >>>>> >>>>> On 9/30/2025 9:51 PM, syzbot wrote: >>>>>> Hello, >>>>>> >>>>>> syzbot has tested the proposed patch but the reproducer is still triggering an issue: >>>>>> lost connection to test machine >>>>>> >>>>>> >>>>>> >>>>>> Tested on: >>>>>> >>>>>> commit: d8795075 mm/huge_memory: do not change split_huge_page.. >>>>>> git tree: https://github.com/x-y-z/linux-dev.git fix_split_page_min_order-for-kernelci >>>>>> console output: https://syzkaller.appspot.com/x/log.txt?x=17ce96e2580000 >>>>>> kernel config: https://syzkaller.appspot.com/x/.config?x=714d45b6135c308e >>>>>> dashboard link: https://syzkaller.appspot.com/bug?extid=e6367ea2fdab6ed46056 >>>>>> compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 >>>>>> userspace arch: arm64 >>>>>> >>>>>> Note: no patches were applied. >>>>>> >>>>> >>>> >>>> Thank you for looking into this. >>>> >>>>> My hunch is that >>>>> https://github.com/x-y-z/linux-dev.git fix_split_page_min_order-for-kernelci >>>>> alone is not enough. Perhaps on ARM64, the page cache pages of /dev/nullb0 in >>>> Yes, it only has the first patch, which fails a split if it cannot be >>>> split to the intended order (order-0 in this case). >>>> >>>> >>>>> the test case are probably with min_order > 0, therefore THP split fails, as the console message show: >>>>> [ 200.378989][T18221] Memory failure: 0x124d30: recovery action for unsplit thp: Failed >>>>> >>>>> With lots of poisoned THP pages stuck in the page cache, OOM could trigger too soon. >>>> >>>> That is my understanding too. Thanks for the confirmation. >>>> >>>>> >>>>> I think it's worth to try add the additional changes I suggested earlier - >>>>> https://lore.kernel.org/lkml/7577871f-06be-492d-b6d7-8404d7a045e0@oracle.com/ >>>>> >>>>> So that in the madvise HWPOISON cases, large huge pages are splitted to smaller huge pages, and most of them remain usable in the page cache. >>>> >>>> Yep, I am going to incorporate your suggestion as the second patch and make >>>> syzbot check it again. >>> >>> >>> #syz test: https://github.com/x-y-z/linux-dev.git fix_split_page_min_order_and_opt_memory_failure-for-kernelci >>> >> >> There is a bug here, >> >> if (try_to_split_thp_page(p, new_order, false) || new_order) { >> res = -EHWPOISON; >> kill_procs_now(p, pfn, flags, folio); <--- >> >> If try_to_split_thp_page() succeeded on min_order, 'folio' should be retaken: folio = page_folio(page) before moving on to kill_procs_now(). > > Thank you for pointing it out. Let me fix it and let syzbot test it again. > > BTW, do you mind explaining why soft offline case does not want to split? > Like memory failure case, splitting it would make other after-split folios > available. That's exactly what I think. Let's wait for Miaohe, not sure if he has other concern. thanks, -jane > > Thanks. > > Best Regards, > Yan, Zi